A kind of preparation method of pre-reduced copper-zinc-aluminum low temperature shift catalyst

Abstract

The invention discloses a preparation method for a pre-reduction type copper-zinc-aluminum low-temperature shift catalyst. The preparation method comprises the following steps of putting the existingoxidizing type copper-zinc-aluminum low-temperature shift catalyst into a reduction furnace, and introducing reductive gas into the reduction furnace to perform reduction reaction on the catalyst; when the catalyst is completely reduced in the reduction furnace introducing a stabilizer into the reduction furnace to react with the catalyst; packaging the copper-zinc-aluminum low-temperature shift catalyst in the reduction furnace under the protection environment of non-oxidizing gas. The preparation method has the advantages that the pre-reduction type is adopted for the copper-zinc-aluminum low-temperature shift catalyst, and the re-reduction is not needed before the catalyst is used for a factory; the activity of the catalyst is equivalent to the activity of the market industrial low-temperature shift catalyst after reduction, so that a large amount of production time of the factory is shortened, and a large amount of reduction cost of the factory is reduced; the reduction step of thefactory is not needed, and the temperature runaway due to false operation in the reduction process of the factory is avoided.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to the CO shift reaction (CO+H 2 O=CO 2 +H 2 ) preparation of commonly used catalysts, in particular to a preparation method of a pre-reduced copper-zinc-aluminum low-temperature shift catalyst. Background technique [0002] The copper-zinc-aluminum low-temperature shift catalyst is mainly used for hydrogen production in the low-temperature shift section of the ammonia synthesis process. In the low-temperature shift section, the process gas containing about 4% CO in the outlet gas of the high-temperature shift section passes through the copper-zinc-aluminum low-temperature shift catalyst bed and is converted into CO at about 200°C 2 and H 2 , The export CO content is below 0.4%. At present, the main components of the existing copper-zinc-aluminum low-temperature shift catalysts are copper-zinc-aluminum oxides. Since the active center of the low-temperature shift cata...

AI Technical Summary

Problems solved by technology

UCI once had a C18-HCRS catalyst report [Nitrogen NO.168, July-August 1987]. This catalyst was prepared by passivation after reduction to form a protective film. Since the reduction degree of this catalyst is low (87%), it should be used before use. It needs to be reduced again, so the promotion value of the catalyst is reduced

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